Contents of the Paton Welding Journal
no.4, 2008 |
|
Page |
| SCIENTIFIC AND TECHNICAL |
Knysh V.V., Valteris I.I., Kuzmenko A.Z. and Solovej S.A. Corrosion fatigue resistance of welded joints strengthened by high-frequency mechanical peening | 2 |
|
The paper gives the results of investigation of the influence of corrosive environment on lowering of fatigue resistance of tee welded joints on 10KhSND steel unstrengthened and strengthened by high-frequency mechanical peening (HFMP). The high effectiveness of application of HFMP technology as a method of surface plastic deformation of metal near the areas of fatigue damage localization to improve corrosion fatigue was established experimentally. Application of HFMP technology improves the cyclic fatigue life of tee welded joints in a corrosive environment 3.5 times and endurance limit by 80 %. |
Pekarska V. Numerical simulation of metal structure in HAZ in welding of increased strength steel | 5 |
|
A mathematical model is proposed, which describes the temperature field and phase transformations in laser welding. The temperature field is determined by the equation of an unsteady heat flow with a convection term using Green's function. Model of the phase transformations in solid state for the steel being welded is based on assumption of continuous cooling and Avrami, Koistinen and Marburger equations. Volume fractions of phases during cooling are defined as functions of the cooling temperature and rate, and deformation increment depends upon the temperature and phase transformations. Metal structure in the welded joint HAZ was evaluated. |
Borisov Yu.S., Borisova A.L., Tunik A.Yu., Karpets M.V., Vojnarovich S.G., Kislitsa A.N. and Kuzmich-Yanchuk E.K. Effect of microplasma spraying parameters on structure, phase composition and texture of hydroxyapatite coatings | 10 |
|
Hydroxyapatite (HA) coatings were deposited on a titanium alloy substrate by the microplasma spraying (MPS) method. The method of factorial experiment with fractional replicas was used to study relationship between the MPS parameters (current, plasma gas flow rate, spraying distance, and powder consumption) and characteristics of the HA coatings (microstructure, morphology, content of crystalline and amorphous phases, and texture). The effect of coating thickness and subsequent heat treatment of the deposited layer on phase composition and texture of the coatings was calculated. The results demonstrate that the coating formation process has some special features under the MPS conditions. |
Milenin A.S. Physical and technological aspects of braze-welding of titanium-aluminium joints (Review) | 16 |
|
Analysis of key problems arising in braze-welding of dissimilar joints of titanium and aluminium has been performed. Regularities of the processes determining the performance of dissimilar structures are shown. Recommendations on optimization of technological processes are given, which allow producing sound titanium-aluminium braze-welded components. |
Silchenko T.Sh., Kuzmin S.V., Lysak V.I., Gorobtsov A.S. and Dolgy Yu.G. Estimation of vertical displacement of flyer metal plates before contact point in explosion welding | 20 |
|
A new methodology for experimental investigation of displacement of the flyer plate sections before contact point in vertical direction in the process of explosion welding is considered. Some results of this displacement evaluation are presented. |
| INDUSTRIAL |
Makhnenko V.I., Zhudra A.P., Velikoivanenko E.A., Bely A.I. and Dzykovich V.I. Prediction of the size of granules and efficiency of their production in centrifugal spraying of alloys | 24 |
|
The calculation method based on generalisation of the experimental data and results of mathematical modelling is proposed for prediction of the size of granules and efficiency of their production depending upon the centrifugal granulation process parameters. |
Yavorsky Yu.D., Kuchuk-Yatsenko S.I. and Losev L.N. Experimental estimation of carrying capacity of butt welded joints of structural shapes in elements of structures subjected to low-cycle load | 32 |
|
Procedures and results of investigation of the carrying capacity of butt welded joints subjected to low-cycle loading, are presented. Recommendations are given on improvement of the carrying capacity of welded joints produced by resistance welding. |
Kononenko V.Ya. Hyperbaric dry underwater welding (Review) | 36 |
|
World experience in the field of technologies of underwater welding in a dry chamber is considered. Features of their application in assembly, manufacturing and repair of critical structures and constructions are shown. |
| BRIEF INFORMATION |
Kolyada V.A. and Shapovalov E.V. Calibration of an optical system for evaluation of temperature field distribution in the welding zone | 41 |
|
A procedure is proposed for calibration of an optical system designed for evaluation of temperature field distribution in the welding zone. Calibration allows compensation of all the inherent and setting errors of sensor block components. |
News | 44
Developed at PWI | 15
23
46
47 |
|
